I believe it to be 5mg Lisinopril
I couldn't find an image, but that's what my database says it is.
LISINOPRIL (Prinivil(R), Zestril(R)) is an antihypertensive (blood pressure lowering agent) known as an ACE inhibitor. Lisinopril controls high blood pressure (hypertension) by relaxing blood vessels

I have some that are round and yellow and imprinted with L in black ink. Often some companies use the same imprint on different colored pills, and aspirin 81 mg is readily available in both yellow and peach.

So please tell us more about the imprint. Is it stamped in black or is it engraved into the pill? Thanks.

I'm not a pharmacist or a medical doctor. This message is not medical advice nor is it an offer to provide medical advice. All drug identifications should be validated by a licensed MD or pharmacist.